car body acceleration is an important factor affecting track safety and ride comfort, which are two primary aspects of railway systems. though track level is an important source of wagon body acceleration, no quantitative relation between them is available and the aim of this paper is to propose a method to address this issue. to do so, car body acceleration is determined using a 10 dof simulat...

the evaluation and control of the trains induced vibrations needs even more attention in the case of underground tracks which passes near to monuments and historical sites. the rail corrugations which occur due to the wheels’ impulse loads during the operation period of underground railway tracks, usually amplify the ground borne noise and vibration. in the current study, the mentioned phenomen...

The paper presents the results of comparison quality indices brake shoes for railroad rolling stock made synthetic cast iron smelted in induction furnaces and composite material which is a vulcanized mixture rubber different fillers. Disclosed are disadvantages pads. Defects working surface railway wheels caused by application pads rubber-asbestos or shown. Parameters C, Si, Mn, P, S content ca...

This paper deals with the structure of the kinematic models of wheeled mobile robots (WMR). A wheeled mobile robot here considered as a planer rigid body that rides on an arbitrary number of wheels. In this paper it is shown that, for a large class of possible configurations of wheels, five types of configurations can be done namely i) fixed standard wheels, ii) steerable standard wheels, iii) ...

apart from regular wheel wear such as decreasing wheel diameters and reduced flange thicknesses and heights, wheel flats (wf) and oval wheels (or oor, out-of-roundness) are the most common wheelset problems for railway vehicles. within the fp7 research project “saferail”, apt has developed an innovative wheelset monitoring system so-called “wheel flat and out of roundness monitoring (worm) syst...

On the face of it, the 5 June ruling by the U.S. Court of Appeals for the District of Columbia Circuit, affirming the earlier dismissal of the youths’ case, is a setback. However, the Court’s ruling positions the case to proceed to the Supreme Court on the question of whether the federal government has a public trust obligation to its citizens. The Court of Appeals focused on a recent U.S. Supr...

In this research we outline control system for wheels mobile rovers which are very important for recent and future research. The wheel type mobile rovers are one of the most practical and widespread robots. Wheels mobile rovers have a simple drive mechanism, and high energy efficiency. In this paper we present {2n+2, 0≤n≤3} wheels mobile rovers, presented by two wheels rover Super Mario, four w...

the main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. therefore, railway track desig...

We build unbounded classes of plane and projective plane multiwheels that are 4-critical that are received summing odd wheels as edge sums modulo two. These classes can be considered as ascending from single common graph that can be received as edge sum modulo two of the octahedron graph O and the minimal wheel W3.

We study the unwheeled rational Kontsevich integral of torus knots. We give a precise formula for these invariants up to loop degree 3 and show that they appear as colorings of simple diagrams. We show that they behave under cyclic branched coverings in a very simple way. Our proof is combinatorial: it uses the results of Wheels and Wheelings and new decorations of diagrams.